Hi, mgautam@xxxxxxxxxxxxxx writes: > On 2016-09-22 18:46, yfw wrote: >> Hi list, >> I tried to enable the high speed, high bandwidth transfer in device >> mode for iso type on dwc3 based soc. The platform only supports usb >> device 2.0. >> >> I set the MaxPacketSize to 0x1400 so the host could allocate 3072 >> bytes for uframe. But when I chain three trbs together, the dwc3 >> behavior is quite weird: >> > > Why are you using three TRBs for one service interval? Is the data > not contiguous? right, if the data isn't contiguous then you MUST use a scatterlist so driver knows to use CHN bit. If it is contiguous, you can send a single struct usb_request with size 3072. > Since, in your case all 3072 bytes belong to one service interval, > could just one TRB be used with PktCntM1 set to '2' ? currently, dwc3 doesn't set PktCntM1. I have provided patches setting that, however. -- balbi
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